diff --git a/SpaceInvaders.cabal b/SpaceInvaders.cabal
--- a/SpaceInvaders.cabal
+++ b/SpaceInvaders.cabal
@@ -1,5 +1,5 @@
 name: SpaceInvaders
-version: 0.4.1
+version: 0.4.2
 cabal-Version: >= 1.2
 license: BSD3
 license-file: LICENSE
@@ -13,8 +13,8 @@
 
 executable spaceInvaders
   hs-source-dirs:  src
-  ghc-options : -O2 -Wall -fno-warn-name-shadowing
-  build-Depends: base, array, random, HGL, Yampa >= 0.9.2
+  ghc-options : -threaded -O3 -Wall -fno-warn-name-shadowing
+  build-Depends: base >= 3 && < 5, array, random, HGL, Yampa >= 0.9.2
   main-is: Main.hs
   Extensions: Arrows
   Other-Modules: